Dialdehyde-Inulin

FIGURE 5.6 Synthesis of inulin ethers, dialdehyde-inulin, inulin carbamates, and inulin coupled to amino acids. 

Butenediol Succinic acid Lactic acid Inulin esters O-Succinoylated inulin Methylated inulin Inulin carbonates 0-(Carboxymethyl)inulin Inulin ethers Dialdehyde inulin Inulin carbamates Inulin-amino acids 0-(Cyanoethyl)inulin... 

Furan-2,5-dicarboxylic add also has tremendous industrial potential, because it could replace oil-derived diadds such as adipic or terephthalic acid as monomers for polyesters and polyamides [98, 99]. This diadd can be synthesized by Pt-catalyzed oxidation with 02 of 5-hydroxymethylfurfural the latter is obtained by acid-catalyzed dehydration of D-frudose or frudosans (inulin) the latter, however, are too expensive as starting materials, and yields from glucose-based waste raw materials are no higher than 40%. Therefore, the potential attractive option of furan-2,5-dicarboxylic acid will develop only after an effident generation of 5-hydroxymethylfurfural from forestry waste materials has been developed. The same compound is also the starting material for the synthesis of other interesting chemicals obtained by oxidative processes, such as 5-hydroxymethylfuroic add, 5-formylfuran-2-carboxylic add and the 1,6-dialdehyde. 

Inulin can be modified to compounds that display good heavy metal complexing properties similar to ethylene diamine tetra-acetic acid (EDTA) but with better biodegradation properties (Bogaert et al., 1998). Inulin is first oxidized using sodium periodate to the dialdehyde, and then reduced to a polyol using Pt/C and hydrogen. The polyol can then be modified with carbon disulfide to form xanthate or with S03-pyridine to obtain an inulin sulfate. Alternatively, the dialdehyde can be animated with diaminoethane and sodium cyanoborohydride and the product reacted with monochloroacetic acid sodium salt to form carboxymethylamino inulin. Each of these compounds can be used to precipitate heavy metals. 

Reaction of inulin dialdehyde (In-CHO) with an excess of procainamide at pH = 5 gave the corresponding Schiff base derivative (V) ... 

Table 6. Analysis of the dialdehyde content in oxidized inulin. ...

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